[coyotos-dev] Sleep, wakeup, and persistence

[Valerio Bellizzomi]

On 14/09/2007, at 23.02, Jonathan S. Shapiro wrote:

>On Fri, 2007-09-14 at 22:53 +0200, Valerio Bellizzomi wrote:
>> >That way, our embedded system can have the time punched into its
>> >panel/ask some network server and eventually get an answer.  In the
>> >meantime, it can be relying on the kernel for short timeouts.  A PC
>> >would be able to get a good estimate of the real time from its clock
>> >quickly so will be able to start servicing "real time" alarms (for
lack
>> >of a better word) quickly.
>> 
>> 
>> There is a problem with that, I have a P4 mainboard that gains seconds
>> faster than NTP clock.
>> The mainboard clock counts faster than real time, so when NTP time is
>> updated, the real time actually goes backwards.
>
>1. This is a mis-statement
>2. Get a newer Linux system.

That machine is running Fedora Core 4.

>
>This is a mis-statement because the issue here is a software problem. It
>is true that the wall-clock time source on a PC mainboard advances at an
>incorrect rate, but the error is well known and correctable.
>
>Recent Linux system adjust time incrementally in order to avoid
>non-monotonic time shifts. See "adjtime".

The problem is absent on the other machine with Fedora 6.

>
>shap
>-- 
>Jonathan S. Shapiro
>Managing Director
>The EROS Group, LLC
>www.coyotos.org, www.eros-os.org
>
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